<?php
namespace app\common\controller;
use app\common\controller\Homebase;
use \think\Loader;
use \think\Session;
error_reporting(0);

/*
**wx607a147f493ac596
*/

class Jssdk extends Homebase {
	
	// 优先加载
	public function  _initialize() {
		parent::_initialize();
		session_start();
		
	}
	
public function __construct($appId, $appSecret) {
    $this->appId = $appId;
    $this->appSecret = $appSecret;
  }

  public function getSignPackage() {
  	
    $jsapiTicket = $this->getJsApiTicket();

    
    // 注意 URL 一定要动态获取，不能 hardcode.
    $protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] !== 'off' || $_SERVER['SERVER_PORT'] == 443) ? "https://" : "http://";
    $url = "$protocol$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";

    $timestamp = time();
    $nonceStr = $this->createNonceStr();

    // 这里参数的顺序要按照 key 值 ASCII 码升序排序
    $string = "jsapi_ticket=$jsapiTicket&noncestr=$nonceStr&timestamp=$timestamp&url=$url";

    $signature = sha1($string);

    $signPackage = array(
      "appId"     => $this->appId,
      "nonceStr"  => $nonceStr,
      "timestamp" => $timestamp,
      "url"       => $url,
      "signature" => $signature,
      "rawString" => $string
    );
    return $signPackage; 
  }

  private function createNonceStr($length = 16) {
    $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    $str = "";
    for ($i = 0; $i < $length; $i++) {
      $str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
    }
    return $str;
  }

    private function get_php_file($name) {
        return session($name);
    }
    private function set_php_file($name, $content) {
        session($name,$content);
    }
 
  private function getJsApiTicket() {
  	// jsapi_ticket 应该全局存储与更新，以下代码以写入到文件中做示例
  	$data = json_decode($this->get_php_file($_ENV['DEFINE_WECHAT_TICKET']));
  	if (empty($data)||$data->expire_time < time()) {
  		$accessToken = $this->getAccessToken();
  		// 如果是企业号用以下 URL 获取 ticket
  		// $url = "https://qyapi.weixin.qq.com/cgi-bin/get_jsapi_ticket?access_token=$accessToken";
  		$url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?type=jsapi&access_token=$accessToken";
  		$res = json_decode($this->httpGet($url));
  		$ticket = $res->ticket;
  		if ($ticket) {
  			if (empty($data)) {
  				$data = (object)array();
  			}
  			$data->expire_time = time() + 6000;
  			$data->jsapi_ticket = $ticket;
  			$this->set_php_file($_ENV['DEFINE_WECHAT_TICKET'], json_encode($data));
  		}
  	} else {
  		$ticket = $data->jsapi_ticket;
  	}
  
  	return $ticket;
  }
  
  
  public function getAccessToken($is_invalid = false) {
  	//dd('封印');
  	// access_token 应该全局存储与更新，以下代码以写入到文件中做示例
  	$data = json_decode($this->get_php_file($_ENV['DEFINE_WECHAT_ACCESSTOKEN']));
  	if (empty($data)||$data->expire_time < time()||$is_invalid == true) {
  		// if (time()) {
  		// 如果是企业号用以下URL获取access_token
  		// $url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken?corpid=$this->appId&corpsecret=$this->appSecret";
  		$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=$this->appId&secret=$this->appSecret";
  		$res = json_decode($this->httpGet($url));
  		//var_dump($res);die;
  		$access_token = $res->access_token;
  		if ($access_token) {
  			if (empty($data)) {
  				$data = (object)array();
  			}
  			$data->expire_time = time() + 6000;
  			$data->access_token = $access_token;
  			$this->set_php_file($_ENV['DEFINE_WECHAT_ACCESSTOKEN'], json_encode($data));
  		}
  	} else {
  		$access_token = $data->access_token;
  	}
  	return $access_token;
  }
  private function httpGet($url) {
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLOPT_TIMEOUT, 500);
    // 为保证第三方服务器与微信服务器之间数据传输的安全性，所有微信接口采用https方式调用，必须使用下面2行代码打开ssl安全校验。
    // 如果在部署过程中代码在此处验证失败，请到 http://curl.haxx.se/ca/cacert.pem 下载新的证书判别文件。
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
    curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, true);
    curl_setopt($curl, CURLOPT_URL, $url);

    $res = curl_exec($curl);
    curl_close($curl);

    return $res;
  }

}
	